.nav {
  height: 100px;
  background-color: #8ECAFE;
  text-align: center;
  line-height: 100px;
  font-size: 40px;
  color: #039789;
}
body{
  background: url('../img/bg1.png') no-repeat center fixed;
  background-size: cover;
}
.box {
  width: 400px;
  margin: 100px auto;
  border: 1px solid black;
  text-align: center;
}
.box form>div {
  height: 40px;
  line-height: 40px;
}
input {
  display: inline-block;
}
span {
  display: inline-block;
  margin-right: 20px;
}
h1,h2{
  height: 40px;
  line-height: 40px;
}